JNI : calling native code from java

[shoikatroy]

hi i just wanted to parse a file to find certain associated data
for ex if my text file is :
<!#first>This is string1
<!second>THis is string2
So if user types in first...he will get This is string 1
iv written a simple C++ code to parse the text file
but now i need to call that native code from a java source
i tried to write the native function but dont have much idea abt JNI so could someone help me out pls...


jstring
Java_com_exampl e_hellojni_Hell oJni_stringFrom JNI( JNIEnv* env,
jobject thiz,jstring javaString )
{



using namespace std;
const char *nativeString = env->GetStringUTFCh ars(javaString, 0);
string val1,val2;
string inp(nativeStrin g);
cout<<"enter:";
cin>>inp;
string line;
ifstream myfile ("data.txt") ;
if(myfile.is_op en())
{
while(!myfile.e of())
{
getline(myfile, line,'<');

istringstream iss1(line);
getline(iss1,va l1,'>');
val1.erase(0,2) ;
getline(iss1,va l2);

if(inp.compare( val1)==0)
cout<<"\n Our returned string is : "<<val2;
}
}
char buffer[20]
strcpy(buffer, val2.c_str());


return *env->NewStringUTF(e nv, buffer);

}

[myusernotyours]

This more has to do with Java than C/C++, better to ask this kind of question on the Java forum...

Also you could do this in pure Java. Is there any specific reason for using native code?

There is a wealth of information that you may want to look at here.

King Regards,

Alex.

[shoikatroy]

hey thanks...
theres no real reason as such..
it can be done with pure java but i wanted to try getting the hang of using native code..so im just trying to learn it myself
thanks

[myusernotyours]

Okay then, I imagined so too. Go ahead and check out that link.
Get back here if you get into any problems. Good Luck!

Alex.